面向信道簇模型的太赫兹宽带混合预编码

Wideband hybrid precoding for THz massive MIMO with angular spread

太赫兹宽带混合预编码是未来高速无线传输的关键技术.太赫兹系统带宽较大,因而存在严重的波束分裂现象,限制了用户的通信速率.已有方案主要研究如何克服信道径模型下的波束分裂现象,在存在角度扩展的信道簇模型下性能损失严重.针对这一问题,首先分析比较了信道簇模型下典型太赫兹预编码的性能;接着提出了时相联合优化算法,以克服信道簇模型下的波束分裂现象;最后提供仿真结果验证所提算法的性能.

Terahertz(THz)wideband hybrid precoding is a promising technology for enabling Tbps transmission in 6G massive multiple-input-multiple-output(MIMO)systems.Despite the abundant spectrum resources,a severe beam-split effect will be induced in THz massive MIMO communications,degrading the system capacity.The existing THz wideband precoding schemes mainly focus on overcoming the beam-split effect in line-of-sight(LOS)scenarios but cannot cope with the beam-split effect in non-LOS(NLOS)scenarios in the presence of angular spread.To address this issue,we first analyzed and compared the differences in the beam-split effect in LOS and NLOS scenarios.Then,a delay-time joint optimization algorithm is proposed to mitigate the beam-split effect in NLOS scenarios.Finally,simulations were conducted to verify the effectiveness of the proposed method.